My powerbook G4 (OSX 10.5) is starting to run slow:
- Applications are take longer to open and they lag a lot
- Online java applets also lag a lot
- Downloads also take a huge amount of time (but thats probably not my computers fault)

is there anything i can do to speed it up?

here are all the specs:
1.33GHz
768MB of RAM
7.47GB out of 55GB of memory left